Re: [RFC PULL] remove arch/h8300

[Greg Ungerer]

On 9/4/22 11:59, Finn Thain wrote:
> On Fri, 8 Apr 2022, Rob Landley wrote:
>
> > On 4/5/22 08:07, Greg Ungerer wrote:
> > > On 5/4/22 13:23, Daniel Palmer wrote:
> > > > On Mon, 4 Apr 2022 at 22:42, Greg Ungerer <gerg@xxxxxxxxxxxxxx> wrote:
> > > > > But we could consider the Dragonball support for removal. I keep it
> > > > > compiling, but I don't use it and can't test that it actually works.
> > > > > Not sure that it has been used for a very long time now. And I
> > > > > didn't even realize but its serial driver (68328serial.c) was
> > > > > removed in 2015. No one seems too have noticed and complained.
> > > >
> > > > I noticed this and I am working on fixing it up for a new Dragonball
> > > > homebrew machine. I'm trying to add a 68000 machine to QEMU to make
> > > > the development easier because I'm currently waiting an hour or more
> > > > for a kernel to load over serial. It might be a few months.
> >
> > I've been booting Linux on qemu-system-m68k -M q800 for a couple years
> > now? (The CROSS=m68k target of mkroot in toybox?)
> >
> > # cat /proc/cpuinfo
> > CPU:		68040
> > MMU:		68040
> > FPU:		68040
> > Clocking:	1261.9MHz
> > BogoMips:	841.31
> > Calibration:	4206592 loops
> >
> > It certainly THINKS it's got m68000...
>
> Most 68040 processor variants have a built-in MMU and the m68k "nommu"
> Linux port doesn't support them. The nommu port covers processors like
> 68000, Dragonball etc. whereas the m68k "mmu" port covers 680x0 where x is
> one of 2,3,4,6 with MMU.
>
> > $ qemu-system-m68k -cpu ?
> > cfv4e
> > m5206
> > m5208
> > m68000
> > m68010
> > m68020
> > m68030
> > m68040
> > m68060
> > any
> >
> > (I'd love to get an m68k nommu system working but never sat down and
> > worked out a kernel .config qemu agreed to run, plus compiler and libc.
> > Musl added m68k support but I dunno if that includes coldfire?)
>
> I could never figure out how to boot a coldfire machine in qemu either.
> There was no documentation about that back when I attempted it but maybe
> things have improved since.

FWIW this will do it:

    qemu-system-m68k -nographic -machine mcf5208evb -kernel vmlinux

That will boot an m5208evb_defconfig generated vmlinux.
But you will need a user space to get a full boot to login/shell.

Regards
Greg